Muffle furnace



(No Model.)

2 Sheets-Sheet I.

AGE. Patented Nov. 17, 1891.

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(No Model.) I 2 Sheets-Sheet E. O. GOSS. v

MUFFLE FURNACE.

No. 463,401. Patented Nov. 17, 1891."

Waterbury, in the county of New Haven and UNITED. STATES 'ATENT FFICE.

EDWVARD O. GOSS, OF WATERBURY, CONNECTICUT, ASSIGNOR TO THE SCOVILLMANUFACTURING COMPANY, OF SAME PLACE.

MUFFLE-FURNACE.

SPECIFICATION forming part of Letters Patent No. 463,401, dated November17, 1891.

Application filed November 1'7, 1890. Serial No- 371,668. (No model.) 7

T0 aZZ whom it may concern:

Be it known that I, EDWARD O. GOSS, of

State of Connecticut, have invented a new Improvem'ent inMuffie-Furnaces; and I do hereby declare the following, when taken inconnection with accompanying drawings and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in-

Figure 1, a view in transverse section through a portion of the masonryof a mufflefurnace, showing one of my improved combustion-chambers andthe adjuncts thereof in longitudinal section; Fig. 2, a sectional viewof the same parts in horizontal section on the irregular line a b ofFig. 1; Fig. 3, a View in vertical section on the line 0 dof Fig.1,looking inward; Fig. 4, a similar View on the same line, but lookingoutward. Fig. 5 is a view in transverse. section through amuflle-furnace constructed in accordance with my invention and showing acombustion-chamber with the adjuncts thereof in each of its side walls.

My invention relates to an improvement in that class of muffle-furnaceswhich employ oil as a fuel, the object being to increase theirefficiency and to render them easy of renewal and repair; Y

With these ends in view my invention consists in certain details ofconstruction and combinations of parts, as will be hereinafterdescribed, and pointed out in the claims.

As herein shown, the combustion-chamber A is located between thetapering expansionchamber B and the muffle-chamber 0, communicatingdirectly with the former and with the latter through a long narrowhorizontal discharge-opening D, leading out of its upper end, the saidcombustion-chamber being lo cated substantially in line with the saidexpansion-chamber. The upper wall of the said chamber A is formed byasingle heavy tile E, supported at its side edges upon the masonry F ofthe furnace and abutted at its rear edge against the end of the arch Gthereof. The side Walls of the combustion-chamber are formed by heavyfire-clay tiles H H, fitting closely under the tile E, above mentioned,and

pansion-chamber under high pressure.

set edgewise, so as to converge toward each other at their outer endsupon the side edges of a heavy floor-tile I, placed flatwise andsupported upon themasonry F of the furnace.

The said tile I has its forward edge cut away, as at I, so as to clearit from the destructive action of the burning fuel and air, which issueswith considerable force from the flaring inner end of theexpansion-chamber B aforesaid. A series of chamfered tiles or bricks J,made of fire-clay, are set edgewise side by side upon the rear portionof the tile I and virtually form a portion of the floor of the .which isclosed at its ends by bricks or tiles of fire-clay K and has its upperwall formed by the inner edge of the large roof-tile E. The taperingexpansion-chamber B is formed in aheavy block L, of fire-clay, abuttedagainst the outer edges of the tiles H H and I, set under the outer edgeof the tile E, and otherwise supported and inclosed by the masonry F. Itwill be apparent from the drawings and the foregoing description thateither the roof-tile E or the tile L may be removed and renewed withoutdisturbing any of the other tiles or bricks, and that by removing thetile L the tiles H II I and the chamfered tile-s J may be removed orrenewed without disturbing the roof-tile E. Under my construction,therefore, the furnace is made very easy of renewal and repair. It willbe understood, of course, that a horizontal series of suchcombustion-chambers is formed in each of the side walls of thefurnace;but a description of one suffices for all.

The oil is led to the contracted outer end of the expansion chamber B bymeans of a burner M, which enters the same, sufficient space being leftaround it for the entrance of air, which is drawn inward by the currentscreated by the draft of the furnace and by I the jet of oil, which issprayed into the ex- The oil and air expand and commingle as they I flowalong together and ignite just before they emerge into thecombustion-chamber, where the initial and destructive combustion takesplace. The incandescent and gaseous products of this combustion passinto the muffle-chamber through the discharge-opening leading from thecombustion-chambcr thereinto, and finally pass off, after having donetheir work, through the draft thereof.

The combustion-chambcr is made of sufficient size to permit the requiredexpansion of the fuel and air to permit them to burn freely and shapedat its inner end so as to prevent them from being drawn by the draftinto the muffle-chamber before a thorough combustion has taken place,the dischargeopening being located abovethe main draft of the saidchambers. By thus providing for effecting the initial or destructivecombustion of the fuel and air without the mufflechamber the metalstherein are exposed only to the incandescent gaseousproducts ofcombustion, and, furthermore, a more perfect combustion is secured,inasmuch as the combustion-chamber is small and less liable to bechilled than the muffle-chamber, which must be more or less chilled allthe time by the opening of the doors thereof for the introduction andremoval of the metal. Under my invention, therefore, the efficiency ofthe furnace is increased.

I would have it understood that I do not limit myself to the exactconstruction and arrangement of the tiles herein shown and described,but hold myself at' liberty to make such changes and alterations asfairly fall within the spirit and scope of my invention.

Having fully described m yinvention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a motile-furnace, the combination, with the muffle-chamberthereof, of a combustion-chamber formed entirely within one of the sidewalls of the furnace, the said wall having a discharge'opening formed init and leading from the upper portion of the inner end of the combustionchamber into the muffle-chamber, and a tapering expansionchamber locatedsubstantially in line with the combustion-chamber and formed in a singleblock-tile set into the said furnacewall, the larger end of theexpansion-chamher opening into the outer end of thecombustion-chamber'and its outer smaller end receiving a burner,substantially as set forth.

2. In a muffle-furnace, a combustion-chamber formed in the masonry ofthe furnace by a horizontal roof-tile, a similar floor-tile, side tilessupported by the latter, and chamt'ered tiles, also set up edgewise onthe floor-tile, in combination with a tapering expansion-chamber formedin a single block-tile and also supported by the masonry of the furnace,the roof-tile and block-tile being independently removable, and theside,floor, and chambered tiles being removable without disturbing theroof-tile after the removal of the block-tile, substantially asdescribed.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

EDWARD O. GOSS. Vitnesses:

J. H. FILLING, G. M. DEMoTT.

